Study of Cabozantinib Combined With Atezolizumab Vs. Second Novel Hormonal Therapy in Subjects with Metastatic Castration-Resistant Prostate Cancer


About this study

The purpose of this study is to evaluate the safety and effectiveness of cabozantinib given in combination with atezolizumab versus a second novel hormonal therapy (NHT) in men with metastatic castration-resistant prostate cancer (mCRPC) who have previously been treated with one, and only one, NHT for their prostate cancer disease.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria:

  • Men with histologically or cytologically confirmed adenocarcinoma of the prostate.
  • Prior treatment with one, and only one, NHT (e.g., abiraterone, apalutamide, darolutamide, or enzalutamide) for castration-sensitive locally advanced (T3 or T4) or mCSPC, M0 CRPC, or mCRPC.
  • Surgical or medical castration, with serum testosterone ≤ 50 ng/dL (≤ 1.73 nmol/L) at screening.
  • Measurable (extrapelvic soft tissue) metastatic disease per Investigator assessment defined by at least one of the following: measurable visceral disease (e.g., adrenal, kidney, liver, lung, pancreas, spleen) per RECIST 1.1; OR measurable extrapelvic adenopathy (ie, adenopathy above the aortic bifurcation).
  • Progressive disease at study entry as defined by specific criteria for prostate specific antigen (PSA) progression OR soft tissue disease progression in the opinion of the Investigator.
    • Note: subjects with bone disease progression alone are not eligible.
  • Age ≥ 18 years old or meeting country definition of adult, whichever is older, on the day of consent.
  • ECOG performance status of 0 or 1.
  • Recovery to baseline or ≤ Grade 1 per Common Terminology Criteria for Adverse Events (CTCAE) v5 from toxicities related to any prior treatments, unless AE(s) are clinically nonsignificant and/or stable on supportive therapy in the opinion of the Investigator.
  • Adequate organ and marrow function based upon specific laboratory assessments obtained within 21 days prior to randomization.
  • Understanding and ability to comply with protocol requirements.

Exclusion Criteria:

  • Any prior nonhormonal therapy initiated for the treatment of mCRPC.
  • Receipt of abiraterone within 1 week; cyproterone within 10 days; or flutamide, nilutamide, bicalutamide, enzalutamide, or other androgen-receptor inhibitors within 2 weeks before randomization.
  • Radiation therapy within 4 weeks (2 weeks for bone metastases) prior to randomization (subjects with clinically relevant ongoing complications from prior radiation therapy are not eligible).
  • Known brain metastases or cranial epidural disease unless adequately treated and clinically stable at least 4 weeks prior to randomization.
  • Symptomatic or impending spinal cord compression or cauda equina syndrome.
  • Concomitant anticoagulation with oral anticoagulants (some specific exceptions apply).
  • Administration of a live, attenuated vaccine within 30 days prior to randomization.
  • Systematic treatment with, or any condition requiring, either corticosteroids (> 10 mg daily prednisone equivalent) or other immunosuppressive medications within 14 days prior to randomization.
  • Uncontrolled, significant intercurrent or recent illness.
  • Major surgery within 4 weeks prior to randomization.
  • Corrected QT interval calculated by the Fridericia formula (QTcF) > 480 ms per ECG within 21 days before randomization.
  • Inability or unwillingness to swallow pills or receive IV administration.
  • Previously identified allergy or hypersensitivity to components of the study treatment formulations or history of severe infusion-related reactions to monoclonal antibodies.
  • Any other active malignancy at time of randomization or diagnosis of another malignancy within 2 years prior to randomization that requires active treatment (some exceptions apply such as locally curable cancers that have apparently been cured).

Eligibility last updated 8/26/21. Questions regarding updates should be directed to the study team contact.

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status Contact

Rochester, Minn.

Mayo Clinic principal investigator

Lance Pagliaro, M.D.

Open for enrollment

Contact information:

Cancer Center Clinical Trials Referral Office


More information


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